There are several reasons why the face is particularly red after exercise: 1, the heart rate will increase after exercise, the heart rate will increase to more than 100-120 times / min, will stimulate the sympathetic nerve in the body, sympathetic nerve overexcitation will make capillary congestion enhanced, will be in the facial capillary distribution of the rich areas of congestion, the face will be very red. 2, after exercise the body will obviously make renin – angiotensin -The aldosterone system is activated, which will also cause the skin to appear vascular congestion and redness. 3, the body will release, for example, dopamine, endorphins and other stimulatory neurons and excitatory neuromediators after exercise, and the excitatory neuromediators will cause the face to appear very red clinical symptoms and performance.